thank you jens,I saw ur reply both sides
for this hot tags function that is if user search 'demo1' with high 
frequency
and search 'pika' with low frequency then when we wanna make a rank for 
them
we can know which is used high frequency
for example,we can list the top ten tags but not all

and i found in our aaf has some specific fields such like 
ferret_score,ferret_rank
is that useful for this case?

looking forward to ur response

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